Thanks again. What does the "B" to the lower right of the last letter "F" mean?
This thing has "hi perf" cast all over it...maybe 8 places.
I'll see if I can attch a pic....
thanks again

I think all the BBC blocks except the tall deck truck blocks were given the "high perf" designation, heads that had high perf meant rectangle ports, "pass" heads were oval. Don't know what peanut port heads or TD heads got- and I even ported a set of PP heads years ago...